<template>
  <div>
    {{ num }}
    <button @click="num++">+1</button>
    <button @click="sub">-1</button>
  </div>
</template>
<script setup>
import {ref} from 'vue'
// 事件绑定

let num = ref(10)

const sub = () => {
  num.value--
}
</script>
<style scoped>
</style>